EP0648435A1 - Smoking articles - Google Patents

Smoking articles Download PDF

Info

Publication number
EP0648435A1
EP0648435A1 EP94307290A EP94307290A EP0648435A1 EP 0648435 A1 EP0648435 A1 EP 0648435A1 EP 94307290 A EP94307290 A EP 94307290A EP 94307290 A EP94307290 A EP 94307290A EP 0648435 A1 EP0648435 A1 EP 0648435A1
Authority
EP
European Patent Office
Prior art keywords
filter
ventilation
smoking
article
mouth end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94307290A
Other languages
German (de)
French (fr)
Other versions
EP0648435B1 (en
Inventor
Peter Rex White
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British American Tobacco Investments Ltd
Original Assignee
British American Tobacco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10743773&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0648435(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by British American Tobacco Co Ltd filed Critical British American Tobacco Co Ltd
Publication of EP0648435A1 publication Critical patent/EP0648435A1/en
Application granted granted Critical
Publication of EP0648435B1 publication Critical patent/EP0648435B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure
    • A24D3/043—Tobacco smoke filters characterised by their shape or structure with ventilation means, e.g. air dilution

Definitions

  • the subject invention relates to smoking articles.
  • the subject invention provides a smoking article comprising a smoking material rod and a filter, the NFDPM delivery of the article being not more than about 6mg under standard machine smoking conditions, the filter being ventilated to at least a 50% ventilation value and the ventilation zone being located not less than about 75% of the length of the filter from the mouth end thereof, whereby said article exhibits an enhanced mainstream smoke water-to-tar ratio.
  • Smoking articles according to the subject invention may exhibit a mainstream smoke water-to-tar ratio (X 100) of at least 6 (six).
  • the ventilation level is at least 60%. It is also preferable that the ventilation zone is located not less than about 80% of the length of the filter from the mouth end thereof.
  • the ventilation zone is located at least 20mm from the mouth end of the filter and it may be located 24mm or more from the mouth end.
  • the filter is a mono-filter and is of, substantially at least, homogeneous internal constitution throughout its length. It may comprise as filtration material fibrous cellulose acetate tow.
  • the smoking machine takes a 35cc puff of 2 seconds duration in each minute.
  • the degree of ventilation is taken to be the percentage of the 35cc puff volume which is constituted by ventilation air.
  • tar means total particulate matter of the mainstream smoke less nicotine and water (NFDPM). It is measured according to a standard procedure at standard machine smoking conditions and with the use of a Cambridge filter pad.
  • NFDPM delivery of smoking articles according to the subject invention is not more than about 5.5mg. It may be as low as 2 to 3mg.
  • the ventilation of cigarettes according to the subject invention may be provided by mechanical, laser or electrostatic means and may take the form of a single row of holes extending circumferencially of the filter or of a wider zone of perforation openings. If such zone is of significant width, i.e. that dimension extending lengthwise of the filter, the air flow rate will be higher towards the side of the zone nearer the mouth end of the filter and lower towards the other end. In such case the distance of the zone from the mouth end of the filter is taken to be the distance taken from the mouth end to the effective ventilation mid-point, this latter being the location in the ventilation zone whereof the total ventilation air flow per unit time upstream of the location is equivalent to the total ventilation air flow per unit time downstream of the location.
  • Control cigarettes and cigarettes according to the subject invention had the following features in common.
  • the ventilation line was located at 12mm from the mouth end of the filter, whereas for the cigarettes according to the subject invention the ventilation line was located at 25mm from the mouth end of the filter.
  • the tar deliveries of the control and inventive cigarettes were 5.30 and 5.80 (mg/cigarette) respectively.
  • the water deliveries were 0.25 and 0.43 (mg/cigarette) respectively.
  • the water-to-tar ratio (X100) of the control cigarettes was 4.70, that for the inventive cigarettes was 7.40.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Manufacture Of Tobacco Products (AREA)

Abstract

Smoking articles, cigarettes for example, having a tar delivery of not more than 6mg, a filter ventilation of at least 50% and a ventilation zone located not less than 75% of the length of the filter from the mouth end thereof exhibit enhanced mainstream smoke water-to-tar ratios.

Description

  • The subject invention relates to smoking articles.
  • Smokers of low tar delivery cigarettes have reported that the mainstream smoke therefrom is of a dry character.
  • It is an object of the subject invention to provide low tar delivery cigarettes which exhibit an enhanced mainstream smoke water-to-tar ratio.
  • The subject invention provides a smoking article comprising a smoking material rod and a filter, the NFDPM delivery of the article being not more than about 6mg under standard machine smoking conditions, the filter being ventilated to at least a 50% ventilation value and the ventilation zone being located not less than about 75% of the length of the filter from the mouth end thereof, whereby said article exhibits an enhanced mainstream smoke water-to-tar ratio.
  • Smoking articles according to the subject invention may exhibit a mainstream smoke water-to-tar ratio (X 100) of at least 6 (six).
  • Preferably, the ventilation level is at least 60%. It is also preferable that the ventilation zone is located not less than about 80% of the length of the filter from the mouth end thereof. Advantageously, the ventilation zone is located at least 20mm from the mouth end of the filter and it may be located 24mm or more from the mouth end.
  • Advantageously, the filter is a mono-filter and is of, substantially at least, homogeneous internal constitution throughout its length. It may comprise as filtration material fibrous cellulose acetate tow.
  • When cigarettes are smoked at standard (ISO) machine smoking conditions, the smoking machine takes a 35cc puff of 2 seconds duration in each minute. The degree of ventilation is taken to be the percentage of the 35cc puff volume which is constituted by ventilation air.
  • As used herein the term "tar" means total particulate matter of the mainstream smoke less nicotine and water (NFDPM). It is measured according to a standard procedure at standard machine smoking conditions and with the use of a Cambridge filter pad. Preferably, the NFDPM delivery of smoking articles according to the subject invention is not more than about 5.5mg. It may be as low as 2 to 3mg.
  • The ventilation of cigarettes according to the subject invention may be provided by mechanical, laser or electrostatic means and may take the form of a single row of holes extending circumferencially of the filter or of a wider zone of perforation openings. If such zone is of significant width, i.e. that dimension extending lengthwise of the filter, the air flow rate will be higher towards the side of the zone nearer the mouth end of the filter and lower towards the other end. In such case the distance of the zone from the mouth end of the filter is taken to be the distance taken from the mouth end to the effective ventilation mid-point, this latter being the location in the ventilation zone whereof the total ventilation air flow per unit time upstream of the location is equivalent to the total ventilation air flow per unit time downstream of the location.
    • EXAMPLE
  • Control cigarettes and cigarettes according to the subject invention had the following features in common.
    • Tobacco:
    Virginia Tobacco
    Tobacco rod lengths:
    67mm
    Filter type:
    Cellulose Acetate Mono-Filter
    Filter length:
    27mm
    Ventilation type:
    On-Machine Laser : single line
    Ventilation (%):
    60%
  • For the control cigarettes the ventilation line was located at 12mm from the mouth end of the filter, whereas for the cigarettes according to the subject invention the ventilation line was located at 25mm from the mouth end of the filter.
  • The tar deliveries of the control and inventive cigarettes were 5.30 and 5.80 (mg/cigarette) respectively. The water deliveries were 0.25 and 0.43 (mg/cigarette) respectively. Thus, whereas the water-to-tar ratio (X100) of the control cigarettes was 4.70, that for the inventive cigarettes was 7.40.
  • Smokers reported that the quality of the mainstream smoke of the inventive cigarettes was superior to that of the control cigarettes.

Claims (8)

  1. A smoking article comprising a smoking material rod and a filter, the NFDPM delivery of the article being not more than about 6mg under standard machine smoking conditions, the filter being ventilated to at least a 50% ventilation value and the ventilation zone being located not less than about 75% of the length of the filter from the mouth end thereof, whereby said article exhibits an enhanced mainstream smoke water-to-tar ratio.
  2. An article according to Claim 1, wherein the NFDPM delivery thereof is not more than about 5.5mg.
  3. An article according to Claim 2, wherein the NFDPM delivery thereof is not more than about 3mg.
  4. An article according to Claim 1, 2 or 3, wherein said filter is ventilated to at least a 60% ventilation level.
  5. An article according to any one of Claims 1 to 4, wherein said ventilation zone is located not less than about 80% of the length of the filter from the mouth end thereof.
  6. A smoking article according to any one of the preceding claims, wherein said article exhibits a mainstream water-to-tar ratio (X 100) of at least 6.
  7. A smoking article according to any one of the preceding claims, said smoking article being a cigarette.
  8. A smoking article comprising a smoking material rod and a filter, the NFDPM delivery of the article being not more than about 6mg under standard machine smoking conditions, the filter being ventilated to at least a 50% ventilation value and the ventilation zone being located not less than about 75% of the length of the filter from the mouth end thereof, whereby there is provided a smoking article which exhibits an enhanced mainstream smoke water-to-tar ratio.
EP94307290A 1993-10-19 1994-10-05 Smoking articles Expired - Lifetime EP0648435B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939321536A GB9321536D0 (en) 1993-10-19 1993-10-19 Smoking articles
GB9321536 1993-10-19

Publications (2)

Publication Number Publication Date
EP0648435A1 true EP0648435A1 (en) 1995-04-19
EP0648435B1 EP0648435B1 (en) 1998-05-06

Family

ID=10743773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94307290A Expired - Lifetime EP0648435B1 (en) 1993-10-19 1994-10-05 Smoking articles

Country Status (13)

Country Link
US (1) US5996587A (en)
EP (1) EP0648435B1 (en)
JP (1) JPH09503667A (en)
CN (1) CN1062726C (en)
AT (1) ATE165713T1 (en)
BR (1) BR9403717A (en)
CA (1) CA2174440C (en)
DE (1) DE69410047T2 (en)
DK (1) DK0648435T3 (en)
ES (1) ES2115162T3 (en)
GB (1) GB9321536D0 (en)
RU (1) RU2112408C1 (en)
WO (1) WO1995010951A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1533568A (en) * 1975-12-18 1978-11-29 British American Tobacco Co Filters for smoking articles
GB2190276A (en) * 1986-05-09 1987-11-18 American Tobacco Co A ventilated all-tobacco cigarette
EP0474940A1 (en) * 1990-08-24 1992-03-18 Philip Morris Products Inc. Concentric smoking filter having discrete tow and web filter media
EP0514804A2 (en) * 1991-05-20 1992-11-25 British-American Tobacco Company Limited Improvements relating to smoking articles
DE4118815A1 (en) * 1991-06-07 1992-12-10 Bat Cigarettenfab Gmbh Cigarette filter with improved particle retention - has centre section with axial hollow zone and perforated outer covering between centre section and cigarette

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514804A (en) * 1938-06-03 1939-11-17 English Electric Co Ltd Improvements in electrical switchgear
US3713452A (en) * 1969-05-01 1973-01-30 Delcron Prod Inc Smoking device with controllable air admitting means
US4174719A (en) * 1977-06-29 1979-11-20 Olin Corporation Microperforated filter tip cigarette

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1533568A (en) * 1975-12-18 1978-11-29 British American Tobacco Co Filters for smoking articles
GB2190276A (en) * 1986-05-09 1987-11-18 American Tobacco Co A ventilated all-tobacco cigarette
EP0474940A1 (en) * 1990-08-24 1992-03-18 Philip Morris Products Inc. Concentric smoking filter having discrete tow and web filter media
EP0514804A2 (en) * 1991-05-20 1992-11-25 British-American Tobacco Company Limited Improvements relating to smoking articles
DE4118815A1 (en) * 1991-06-07 1992-12-10 Bat Cigarettenfab Gmbh Cigarette filter with improved particle retention - has centre section with axial hollow zone and perforated outer covering between centre section and cigarette

Also Published As

Publication number Publication date
ATE165713T1 (en) 1998-05-15
US5996587A (en) 1999-12-07
WO1995010951A1 (en) 1995-04-27
RU2112408C1 (en) 1998-06-10
ES2115162T3 (en) 1998-06-16
DE69410047D1 (en) 1998-06-10
BR9403717A (en) 1995-06-20
CN1136766A (en) 1996-11-27
DE69410047T2 (en) 1998-09-17
CA2174440A1 (en) 1995-04-27
GB9321536D0 (en) 1993-12-08
EP0648435B1 (en) 1998-05-06
CN1062726C (en) 2001-03-07
JPH09503667A (en) 1997-04-15
DK0648435T3 (en) 1998-10-07
CA2174440C (en) 2004-06-08

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